<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>


    <script>
        console.log((1/3)===(1-2/3))

        console.log(Math.abs(1 / 3 - (1 - 2 / 3)) < 0.00000001);

        var arr = [1,2,3,4,5,'hello',null,true]

        new Array(1,12,3,4,4,5,'hello')

        //Person person = new Person(1,2,3,4,5)
        var person = {
            name: 'qingjiang',
            age: 3,
            tags: ['js','java','web','...']
        }

    </script>

</head>
<body>

</body>
</html>